protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg != WmDevicechange)
{
return;
}
WM_DeviceChangeMessage wp = (WM_DeviceChangeMessage)m.WParam;
if (wp != WM_DeviceChangeMessage.DBT_DEVICEARRIVAL && wp != WM_DeviceChangeMessage.DBT_DEVICEREMOVECOMPLETE)
{
return;
}
Guid guid = Guid.Empty;
string name = null;
var hdr = (DeviceBroadcastHeader)Marshal.PtrToStructure(m.LParam, typeof(DeviceBroadcastHeader));
DeviceType type = hdr.dbcc_devicetype;
if (type == DeviceType.DBT_DEVTYP_PORT)
{
var prt = (DEV_BROADCAST_PORT)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_PORT));
name = new string(prt.dbcp_name);
}
else if (type == DeviceType.DBT_DEVTYP_DEVICEINTERFACE)
{
var dev = (DEV_BROADCAST_DEVICEINTERFACE)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_DEVICEINTERFACE));
name = new string(dev.dbcc_name);
guid = dev.dbcc_classguid;
}
name = name?.Substring(0, name.IndexOf('\0'));
var args = new UsbNotificationEventArgs(type, name, guid);
if (wp == WM_DeviceChangeMessage.DBT_DEVICEARRIVAL)
{
OnDeviceArrival(args);
}
else
{
OnDeviceRemoveComplete(args);
}
}
private static void OnDeviceRemoveComplete(UsbNotificationEventArgs args)
{
DeviceRemovalComplete?.Invoke(null, args);
}
private static void OnDeviceArrival(UsbNotificationEventArgs args)
{
DeviceArrival?.Invoke(null, args);
}